<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item :to="{ path: '/goods' }">商品列表</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="消息提示的文案" type="info" show-icon center> </el-alert>
      <!-- 步骤条区域 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form
        :model="addGoodsForm"
        :rules="addGoodsFormRules"
        ref="addGoodsFormRef"
        label-width="100"
        label-position="top"
      >
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0"
            ><el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addGoodsForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input
                v-model="addGoodsForm.goods_price"
                type="number"
              ></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input
                v-model="addGoodsForm.goods_weight"
                type="number"
              ></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input
                v-model="addGoodsForm.goods_number"
                type="number"
              ></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!-- 选择商品分类区域 -->
              <el-cascader
                v-model="addGoodsForm.goods_cat"
                :options="catelist"
                :props="{
                  expandTrigger: 'hover',
                  ...cateProps,
                }"
                @change="handleChange"
                clearable
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的Item项 -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableDate"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="cb"
                  v-for="(cb, i) in item.attr_vals"
                  :key="i"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2"
            ><el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input> </el-form-item
          ></el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action 表示图片要上传到的后台APi地址-->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addGoodsForm.goods_introduce">
            </quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg" />
    </el-dialog>
  </div>
</template>
<script>
import _ from 'lodash'

export default
  {
    data() {
      return {
        activeIndex: '0',
        // // 控制添加商品的显示和隐藏
        // addGoodsDialogVisible: false,
        // 添加商品的表单数据
        addGoodsForm: {
          goods_name: '',
          goods_price: 0,
          goods_weight: 0,
          goods_number: 0,
          // 商品所属的分类数组
          goods_cat: [],
          // 图片的数组
          pics: [],
          // 商品的详情描述
          goods_introduce: '',
          attrs: []
        },
        // 表单的验证规则
        addGoodsFormRules: {
          goods_name: [
            { required: true, message: '请输入商品名称', trigger: 'blur' }
          ],
          goods_price: [
            { required: true, message: '请输入商品价格', trigger: 'blur' }
          ],
          goods_weight: [
            { required: true, message: '请输入商品重量', trigger: 'blur' }
          ],
          goods_number: [
            { required: true, message: '请输入商品数量', trigger: 'blur' }
          ],
          goods_cat: [
            { required: true, message: '请输入商品分类', trigger: 'blur' }
          ],
        },
        // 商品分类列表
        catelist: [],
        cateProps: {
          label: 'cat_name',
          value: 'cat_id',
          children: 'children'
        },
        // 动态参数列表数据
        manyTableDate: [],
        // 静态属性列表数据
        onlyTableData: [],
        // 上传图片的URL地址
        uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
        // 图片上传组件的headers请求头对象
        headerObj: {
          Authorization: window.sessionStorage.getItem('token')
        },
        previewPath: '',
        previewVisible: false
      }
    },
    created() {
      this.getCateList()
    },
    methods: {

      // 获取所有商品分类数据
      async getCateList() {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类数据失败！')
        }
        this.catelist = res.data
        // console.log(this.catelist)
      },

      // 级联选择器选中项变化，会触发这个函数
      handleChange() {
        // console.log(this.addGoodsForm.goods_cat);
        if (this.addGoodsForm.goods_cat.length !== 3) {
          this.addGoodsForm.goods_cat = []
        }
      },
      // 设置标签页切换的规则，如果没有选择商品分类就无法进行下一步
      beforeTabLeave(activeName, oldActiveNmae) {
        // console.log('即将离开的标签页名字是:' + oldActiveNmae);
        // console.log('即将进入的标签页名字是:' + activeName);
        // return false
        if (oldActiveNmae === '0' && this.addGoodsForm.goods_cat.length !== 3) {
          this.$message.error('请先选择商品分类！')
          return false
        }
      },

      // 动态参数数据请求
      async tabClicked() {
        // console.log(this.activeIndex);
        // 证明访问的是动态参数面板
        if (this.activeIndex === '1') {
          const { data: res } = await this.$http.get(
            `categories/${this.cateId}/attributes`, { params: { sel: 'many' } }
          )
          if (res.meta.status !== 200) {
            return this.$message.error('获取动态参数列表失败！')
          }
          console.log(res.data)
          res.data.forEach(item => {
            item.attr_vals =
              item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
          })
          this.manyTableDate = res.data
        }
        else if (this.activeIndex === '2') {
          const { data: res } = await this.$http.get(
            `categories/${this.cateId}/attributes`, { params: { sel: 'only' } }
          )
          if (res.meta.status !== 200) {
            return this.$message.error('获取静态属性失败！')
          }

          console.log(res.data);
          this.onlyTableData = res.data
        }
      },

      // 处理图片预览效果
      handlePreview(file) {
        console.log(file);
        this.previewPath = file.response.data.url
        this.previewVisible = true
      },

      // 处理移除图片的操作
      handleRemove(file) {
        console.log(file);
        // 1. 获取将要删除的图片的临时路径
        const filePath = file.response.data.tmp_path
        // 2. 从 pics 数组中，找到这个图片对应的索引值
        const i =
          this.addGoodsForm.pics.findIndex(x => x.pic === filePath)
        // 3. 调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
        this.addGoodsForm.pics.splice(i, 1)
        console.log(this.addGoodsForm);
      },
      // 监听图片上传成功的事件
      handleSuccess(response) {
        console.log(response);
        // 1. 拼接得到一个图片信息对象
        const picInfo = { pic: response.data.tmp_path }
        // 2. 将图片信息对象，push到pics数组中
        this.addGoodsForm.pics.push(picInfo)
        console.log(this.addGoodsForm);
      },
      add() {
        this.$refs.addGoodsFormRef.validate(async valid => {
          // console.log(this.addGoodsForm);
          if (!valid) {
            return this.$message.error('请填写必要的表单项！')
          }
          // 执行添加的业务逻辑
          // 数组改造成字符串
          // lodash  cloneDeep(obj)
          const form = _.cloneDeep(this.addGoodsForm)
          form.goods_cat = form.goods_cat.join(',')
          // 处理动态参数
          this.manyTableDate.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(' ')
            }
            this.addGoodsForm.attrs.push(newInfo)
          })
          // 处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals
            }
            this.addGoodsForm.attrs.push(newInfo)
          })
          form.attrs = this.addGoodsForm.attrs
          console.log(form);

          // 发起请求添加商品
          // 商品的名称，必须是唯一的
          const { data: res } = await this.$http.post('goods', form)

          if (res.meta.status !== 201) {
            return this.$message.error('添加商品失败！')
          }

          this.$message.success('添加商品成功！')
          this.$router.push('/goods')
        })
      }
    },
    computed: {
      cateId() {
        if (this.addGoodsForm.goods_cat.length === 3) {
          return this.addGoodsForm.goods_cat[2]
        }
        return null
      }
    }
  }
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}

.previewImg {
  width: 100%;
}

.btnAdd {
  margin-top: 15px;
}
</style>>